新建/初始化git项目

git config --global user.name "你的名字"
git config --global user.email "你的邮箱"

git clone ${git地址}
cd demo
touch README.md
git add README.md
git commit -m "add README"
git push -u origin master

cd existing_folder
git init
git remote add origin ${git地址}
git add .
git commit
git push -u origin master